Not completely off-topic, there have been some cases in wich I'd definitely like to use the button, but it would give me problems with my network. With long buses that use 2 tiles for example. A bus doesn't move on to the end of a long station like a train, but instead stops at the exact point assigned. If you have stops of 2 tiles long, using the duplicate backwards button causes the bus to stop at the wrong place, like this:

{----------} = 1 station tile[__________] = 1 vehicle tileWhen going back, it uses the exact same tile, wich causes the second car to be unused. Therefore, the way back has to be assigned manually because it uses different tiles.